Finding the Fourth Proportional to 103,621.78, 142,998.06 and 58,909.78

Step by Step Solution

1. Step 1: Write the proportion equation
   103,621.78 : 142,998.06 = 58,909.78 : x
2. Step 2: Convert to fraction form
   103,621.78/142,998.06 = 58,909.78/x
3. Step 3: Cross multiply
   103,621.78x = 142,998.06 × 58,909.78
4. Step 4: Simplify right side
   103,621.78x = 8,423,984,654.69
5. Step 5: Solve for x
   x = 8,423,984,654.69/103,621.78
6. Step 6: Final answer
   x = 81,295.50