Finding the Fourth Proportional to 66,487.55, 91,761.72 and 42,290.87

Step by Step Solution

1. Step 1: Write the proportion equation
   66,487.55 : 91,761.72 = 42,290.87 : x
2. Step 2: Convert to fraction form
   66,487.55/91,761.72 = 42,290.87/x
3. Step 3: Cross multiply
   66,487.55x = 91,761.72 × 42,290.87
4. Step 4: Simplify right side
   66,487.55x = 3,880,682,971.50
5. Step 5: Solve for x
   x = 3,880,682,971.50/66,487.55
6. Step 6: Final answer
   x = 58,367.06