Finding the Fourth Proportional to 78,507.96, 108,339.94 and 42,697.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,507.96 : 108,339.94 = 42,697.20 : x
2. Step 2: Convert to fraction form
   78,507.96/108,339.94 = 42,697.20/x
3. Step 3: Cross multiply
   78,507.96x = 108,339.94 × 42,697.20
4. Step 4: Simplify right side
   78,507.96x = 4,625,812,086.17
5. Step 5: Solve for x
   x = 4,625,812,086.17/78,507.96
6. Step 6: Final answer
   x = 58,921.57