Finding the Fourth Proportional to 21,781.04, 32,642.76 and 7,916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,781.04 : 32,642.76 = 7,916.72 : x
2. Step 2: Convert to fraction form
   21,781.04/32,642.76 = 7,916.72/x
3. Step 3: Cross multiply
   21,781.04x = 32,642.76 × 7,916.72
4. Step 4: Simplify right side
   21,781.04x = 258,423,590.95
5. Step 5: Solve for x
   x = 258,423,590.95/21,781.04
6. Step 6: Final answer
   x = 11,864.61