Finding the Fourth Proportional to 56,884.62, 78,522.30 and 42,778.20

Step by Step Solution

1. Step 1: Write the proportion equation
   56,884.62 : 78,522.30 = 42,778.20 : x
2. Step 2: Convert to fraction form
   56,884.62/78,522.30 = 42,778.20/x
3. Step 3: Cross multiply
   56,884.62x = 78,522.30 × 42,778.20
4. Step 4: Simplify right side
   56,884.62x = 3,359,042,653.86
5. Step 5: Solve for x
   x = 3,359,042,653.86/56,884.62
6. Step 6: Final answer
   x = 59,050.10