Finding the Fourth Proportional to 123,739.26, 170,758.71 and 72,784.86

Step by Step Solution

1. Step 1: Write the proportion equation
   123,739.26 : 170,758.71 = 72,784.86 : x
2. Step 2: Convert to fraction form
   123,739.26/170,758.71 = 72,784.86/x
3. Step 3: Cross multiply
   123,739.26x = 170,758.71 × 72,784.86
4. Step 4: Simplify right side
   123,739.26x = 12,428,648,801.13
5. Step 5: Solve for x
   x = 12,428,648,801.13/123,739.26
6. Step 6: Final answer
   x = 100,442.24