Finding the Fourth Proportional to 66,258.72, 91,458.72 and 42,420.96

Step by Step Solution

1. Step 1: Write the proportion equation
   66,258.72 : 91,458.72 = 42,420.96 : x
2. Step 2: Convert to fraction form
   66,258.72/91,458.72 = 42,420.96/x
3. Step 3: Cross multiply
   66,258.72x = 91,458.72 × 42,420.96
4. Step 4: Simplify right side
   66,258.72x = 3,879,766,702.77
5. Step 5: Solve for x
   x = 3,879,766,702.77/66,258.72
6. Step 6: Final answer
   x = 58,554.81