Finding the Fourth Proportional to 123,513.76, 170,449.04 and 72,516.48

Step by Step Solution

1. Step 1: Write the proportion equation
   123,513.76 : 170,449.04 = 72,516.48 : x
2. Step 2: Convert to fraction form
   123,513.76/170,449.04 = 72,516.48/x
3. Step 3: Cross multiply
   123,513.76x = 170,449.04 × 72,516.48
4. Step 4: Simplify right side
   123,513.76x = 12,360,364,400.18
5. Step 5: Solve for x
   x = 12,360,364,400.18/123,513.76
6. Step 6: Final answer
   x = 100,072.77