Finding the Fourth Proportional to 103,609.56, 142,980.96 and 58,287.56

Step by Step Solution

1. Step 1: Write the proportion equation
   103,609.56 : 142,980.96 = 58,287.56 : x
2. Step 2: Convert to fraction form
   103,609.56/142,980.96 = 58,287.56/x
3. Step 3: Cross multiply
   103,609.56x = 142,980.96 × 58,287.56
4. Step 4: Simplify right side
   103,609.56x = 8,334,011,284.86
5. Step 5: Solve for x
   x = 8,334,011,284.86/103,609.56
6. Step 6: Final answer
   x = 80,436.70