Finding the Fourth Proportional to 20,870.42, 31,314.15 and 7,545.24

Step by Step Solution

1. Step 1: Write the proportion equation
   20,870.42 : 31,314.15 = 7,545.24 : x
2. Step 2: Convert to fraction form
   20,870.42/31,314.15 = 7,545.24/x
3. Step 3: Cross multiply
   20,870.42x = 31,314.15 × 7,545.24
4. Step 4: Simplify right side
   20,870.42x = 236,272,777.15
5. Step 5: Solve for x
   x = 236,272,777.15/20,870.42
6. Step 6: Final answer
   x = 11,320.94