Finding the Fourth Proportional to 122,587, 169,057.72 and 79,521.64

Step by Step Solution

1. Step 1: Write the proportion equation
   122,587 : 169,057.72 = 79,521.64 : x
2. Step 2: Convert to fraction form
   122,587/169,057.72 = 79,521.64/x
3. Step 3: Cross multiply
   122,587x = 169,057.72 × 79,521.64
4. Step 4: Simplify right side
   122,587x = 13,443,747,149.06
5. Step 5: Solve for x
   x = 13,443,747,149.06/122,587
6. Step 6: Final answer
   x = 109,666.99