Finding the Fourth Proportional to 85,610.24, 128,422.38 and 42,900.56

Step by Step Solution

1. Step 1: Write the proportion equation
   85,610.24 : 128,422.38 = 42,900.56 : x
2. Step 2: Convert to fraction form
   85,610.24/128,422.38 = 42,900.56/x
3. Step 3: Cross multiply
   85,610.24x = 128,422.38 × 42,900.56
4. Step 4: Simplify right side
   85,610.24x = 5,509,392,018.53
5. Step 5: Solve for x
   x = 5,509,392,018.53/85,610.24
6. Step 6: Final answer
   x = 64,354.36