Finding the Fourth Proportional to 103,521.10, 155,184.45 and 81,019.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,521.10 : 155,184.45 = 81,019.30 : x
2. Step 2: Convert to fraction form
   103,521.10/155,184.45 = 81,019.30/x
3. Step 3: Cross multiply
   103,521.10x = 155,184.45 × 81,019.30
4. Step 4: Simplify right side
   103,521.10x = 12,572,935,509.89
5. Step 5: Solve for x
   x = 12,572,935,509.89/103,521.10
6. Step 6: Final answer
   x = 121,452.88