Finding the Fourth Proportional to 78,470.78, 108,290.91 and 42,660.93

Step by Step Solution

1. Step 1: Write the proportion equation
   78,470.78 : 108,290.91 = 42,660.93 : x
2. Step 2: Convert to fraction form
   78,470.78/108,290.91 = 42,660.93/x
3. Step 3: Cross multiply
   78,470.78x = 108,290.91 × 42,660.93
4. Step 4: Simplify right side
   78,470.78x = 4,619,791,118.81
5. Step 5: Solve for x
   x = 4,619,791,118.81/78,470.78
6. Step 6: Final answer
   x = 58,872.75