Finding the Fourth Proportional to 672,443,694.41, 927,995,373.61 and 390,164,819.63

Step by Step Solution

1. Step 1: Write the proportion equation
   672,443,694.41 : 927,995,373.61 = 390,164,819.63 : x
2. Step 2: Convert to fraction form
   672,443,694.41/927,995,373.61 = 390,164,819.63/x
3. Step 3: Cross multiply
   672,443,694.41x = 927,995,373.61 × 390,164,819.63
4. Step 4: Simplify right side
   672,443,694.41x = 362,071,147,556,404,736
5. Step 5: Solve for x
   x = 362,071,147,556,404,736/672,443,694.41
6. Step 6: Final answer
   x = 538,440,839.83