Finding the Fourth Proportional to 99,915.32, 137,822.82 and 65,911.73

Step by Step Solution

1. Step 1: Write the proportion equation
   99,915.32 : 137,822.82 = 65,911.73 : x
2. Step 2: Convert to fraction form
   99,915.32/137,822.82 = 65,911.73/x
3. Step 3: Cross multiply
   99,915.32x = 137,822.82 × 65,911.73
4. Step 4: Simplify right side
   99,915.32x = 9,084,139,563.40
5. Step 5: Solve for x
   x = 9,084,139,563.40/99,915.32
6. Step 6: Final answer
   x = 90,918.38