Finding the Fourth Proportional to 78,740.91, 108,664.74 and 42,931.62

Step by Step Solution

1. Step 1: Write the proportion equation
   78,740.91 : 108,664.74 = 42,931.62 : x
2. Step 2: Convert to fraction form
   78,740.91/108,664.74 = 42,931.62/x
3. Step 3: Cross multiply
   78,740.91x = 108,664.74 × 42,931.62
4. Step 4: Simplify right side
   78,740.91x = 4,665,153,325.08
5. Step 5: Solve for x
   x = 4,665,153,325.08/78,740.91
6. Step 6: Final answer
   x = 59,246.88