Finding the Fourth Proportional to 439,799.63, 659,736.50 and 140,322.78

Step by Step Solution

1. Step 1: Write the proportion equation
   439,799.63 : 659,736.50 = 140,322.78 : x
2. Step 2: Convert to fraction form
   439,799.63/659,736.50 = 140,322.78/x
3. Step 3: Cross multiply
   439,799.63x = 659,736.50 × 140,322.78
4. Step 4: Simplify right side
   439,799.63x = 92,576,059,045.86
5. Step 5: Solve for x
   x = 92,576,059,045.86/439,799.63
6. Step 6: Final answer
   x = 210,495.99