Finding the Fourth Proportional to 128,915.86, 193,175.98 and 53,995

Step by Step Solution

1. Step 1: Write the proportion equation
   128,915.86 : 193,175.98 = 53,995 : x
2. Step 2: Convert to fraction form
   128,915.86/193,175.98 = 53,995/x
3. Step 3: Cross multiply
   128,915.86x = 193,175.98 × 53,995
4. Step 4: Simplify right side
   128,915.86x = 10,430,537,040.10
5. Step 5: Solve for x
   x = 10,430,537,040.10/128,915.86
6. Step 6: Final answer
   x = 80,909.65