Finding the Fourth Proportional to 23,060, 31,821.18 and 12,990.08

Step by Step Solution

1. Step 1: Write the proportion equation
   23,060 : 31,821.18 = 12,990.08 : x
2. Step 2: Convert to fraction form
   23,060/31,821.18 = 12,990.08/x
3. Step 3: Cross multiply
   23,060x = 31,821.18 × 12,990.08
4. Step 4: Simplify right side
   23,060x = 413,359,673.89
5. Step 5: Solve for x
   x = 413,359,673.89/23,060
6. Step 6: Final answer
   x = 17,925.40