Finding the Fourth Proportional to 189,498.12, 284,142.72 and 77,149.56

Step by Step Solution

1. Step 1: Write the proportion equation
   189,498.12 : 284,142.72 = 77,149.56 : x
2. Step 2: Convert to fraction form
   189,498.12/284,142.72 = 77,149.56/x
3. Step 3: Cross multiply
   189,498.12x = 284,142.72 × 77,149.56
4. Step 4: Simplify right side
   189,498.12x = 21,921,485,825.20
5. Step 5: Solve for x
   x = 21,921,485,825.20/189,498.12
6. Step 6: Final answer
   x = 115,681.81