Finding the Fourth Proportional to 77,256.17, 106,624.32 and 55,815.31

Step by Step Solution

1. Step 1: Write the proportion equation
   77,256.17 : 106,624.32 = 55,815.31 : x
2. Step 2: Convert to fraction form
   77,256.17/106,624.32 = 55,815.31/x
3. Step 3: Cross multiply
   77,256.17x = 106,624.32 × 55,815.31
4. Step 4: Simplify right side
   77,256.17x = 5,951,268,662.14
5. Step 5: Solve for x
   x = 5,951,268,662.14/77,256.17
6. Step 6: Final answer
   x = 77,032.92