Finding the Fourth Proportional to 102,978.76, 142,110.06 and 57,656.56

Step by Step Solution

1. Step 1: Write the proportion equation
   102,978.76 : 142,110.06 = 57,656.56 : x
2. Step 2: Convert to fraction form
   102,978.76/142,110.06 = 57,656.56/x
3. Step 3: Cross multiply
   102,978.76x = 142,110.06 × 57,656.56
4. Step 4: Simplify right side
   102,978.76x = 8,193,577,200.99
5. Step 5: Solve for x
   x = 8,193,577,200.99/102,978.76
6. Step 6: Final answer
   x = 79,565.70