Finding the Fourth Proportional to 66,462.57, 91,691.33 and 42,603.21

Step by Step Solution

1. Step 1: Write the proportion equation
   66,462.57 : 91,691.33 = 42,603.21 : x
2. Step 2: Convert to fraction form
   66,462.57/91,691.33 = 42,603.21/x
3. Step 3: Cross multiply
   66,462.57x = 91,691.33 × 42,603.21
4. Step 4: Simplify right side
   66,462.57x = 3,906,344,774.15
5. Step 5: Solve for x
   x = 3,906,344,774.15/66,462.57
6. Step 6: Final answer
   x = 58,775.11