Finding the Fourth Proportional to 89,915.80, 134,830.66 and 42,491.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89,915.80 : 134,830.66 = 42,491.31 : x
2. Step 2: Convert to fraction form
   89,915.80/134,830.66 = 42,491.31/x
3. Step 3: Cross multiply
   89,915.80x = 134,830.66 × 42,491.31
4. Step 4: Simplify right side
   89,915.80x = 5,729,131,371.56
5. Step 5: Solve for x
   x = 5,729,131,371.56/89,915.80
6. Step 6: Final answer
   x = 63,716.63