Finding the Fourth Proportional to 77,128.12, 115,560.15 and 42,092.38

Step by Step Solution

1. Step 1: Write the proportion equation
   77,128.12 : 115,560.15 = 42,092.38 : x
2. Step 2: Convert to fraction form
   77,128.12/115,560.15 = 42,092.38/x
3. Step 3: Cross multiply
   77,128.12x = 115,560.15 × 42,092.38
4. Step 4: Simplify right side
   77,128.12x = 4,864,201,746.66
5. Step 5: Solve for x
   x = 4,864,201,746.66/77,128.12
6. Step 6: Final answer
   x = 63,066.52