Finding the Fourth Proportional to 85,724.64, 128,065.59 and 55,492.56

Step by Step Solution

1. Step 1: Write the proportion equation
   85,724.64 : 128,065.59 = 55,492.56 : x
2. Step 2: Convert to fraction form
   85,724.64/128,065.59 = 55,492.56/x
3. Step 3: Cross multiply
   85,724.64x = 128,065.59 × 55,492.56
4. Step 4: Simplify right side
   85,724.64x = 7,106,687,437.01
5. Step 5: Solve for x
   x = 7,106,687,437.01/85,724.64
6. Step 6: Final answer
   x = 82,901.34