Finding the Fourth Proportional to 66,291.47, 91,513.51 and 42,431.98

Step by Step Solution

1. Step 1: Write the proportion equation
   66,291.47 : 91,513.51 = 42,431.98 : x
2. Step 2: Convert to fraction form
   66,291.47/91,513.51 = 42,431.98/x
3. Step 3: Cross multiply
   66,291.47x = 91,513.51 × 42,431.98
4. Step 4: Simplify right side
   66,291.47x = 3,883,098,756.32
5. Step 5: Solve for x
   x = 3,883,098,756.32/66,291.47
6. Step 6: Final answer
   x = 58,576.14