Finding the Fourth Proportional to 85,642.31, 128,475.72 and 26,482.55

Step by Step Solution

1. Step 1: Write the proportion equation
   85,642.31 : 128,475.72 = 26,482.55 : x
2. Step 2: Convert to fraction form
   85,642.31/128,475.72 = 26,482.55/x
3. Step 3: Cross multiply
   85,642.31x = 128,475.72 × 26,482.55
4. Step 4: Simplify right side
   85,642.31x = 3,402,364,036.31
5. Step 5: Solve for x
   x = 3,402,364,036.31/85,642.31
6. Step 6: Final answer
   x = 39,727.61