Finding the Fourth Proportional to 77,128.62, 115,560.90 and 42,092.88

Step by Step Solution

1. Step 1: Write the proportion equation
   77,128.62 : 115,560.90 = 42,092.88 : x
2. Step 2: Convert to fraction form
   77,128.62/115,560.90 = 42,092.88/x
3. Step 3: Cross multiply
   77,128.62x = 115,560.90 × 42,092.88
4. Step 4: Simplify right side
   77,128.62x = 4,864,291,096.39
5. Step 5: Solve for x
   x = 4,864,291,096.39/77,128.62
6. Step 6: Final answer
   x = 63,067.26