Finding the Fourth Proportional to 21,897.18, 32,870.34 and 8,758.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,897.18 : 32,870.34 = 8,758.71 : x
2. Step 2: Convert to fraction form
   21,897.18/32,870.34 = 8,758.71/x
3. Step 3: Cross multiply
   21,897.18x = 32,870.34 × 8,758.71
4. Step 4: Simplify right side
   21,897.18x = 287,901,775.66
5. Step 5: Solve for x
   x = 287,901,775.66/21,897.18
6. Step 6: Final answer
   x = 13,147.89