Finding the Fourth Proportional to 123,276.21, 170,142.02 and 71,585.25

Step by Step Solution

1. Step 1: Write the proportion equation
   123,276.21 : 170,142.02 = 71,585.25 : x
2. Step 2: Convert to fraction form
   123,276.21/170,142.02 = 71,585.25/x
3. Step 3: Cross multiply
   123,276.21x = 170,142.02 × 71,585.25
4. Step 4: Simplify right side
   123,276.21x = 12,179,658,679.28
5. Step 5: Solve for x
   x = 12,179,658,679.28/123,276.21
6. Step 6: Final answer
   x = 98,799.75