Finding the Fourth Proportional to 23,157.47, 31,980.02 and 19,780.61

Step by Step Solution

1. Step 1: Write the proportion equation
   23,157.47 : 31,980.02 = 19,780.61 : x
2. Step 2: Convert to fraction form
   23,157.47/31,980.02 = 19,780.61/x
3. Step 3: Cross multiply
   23,157.47x = 31,980.02 × 19,780.61
4. Step 4: Simplify right side
   23,157.47x = 632,584,044.61
5. Step 5: Solve for x
   x = 632,584,044.61/23,157.47
6. Step 6: Final answer
   x = 27,316.63