Finding the Fourth Proportional to 123,373.76, 170,225.16 and 72,391.28

Step by Step Solution

1. Step 1: Write the proportion equation
   123,373.76 : 170,225.16 = 72,391.28 : x
2. Step 2: Convert to fraction form
   123,373.76/170,225.16 = 72,391.28/x
3. Step 3: Cross multiply
   123,373.76x = 170,225.16 × 72,391.28
4. Step 4: Simplify right side
   123,373.76x = 12,322,817,220.60
5. Step 5: Solve for x
   x = 12,322,817,220.60/123,373.76
6. Step 6: Final answer
   x = 99,881.99