Finding the Fourth Proportional to 21,978.39, 32,969.10 and 8,830.77

Step by Step Solution

1. Step 1: Write the proportion equation
   21,978.39 : 32,969.10 = 8,830.77 : x
2. Step 2: Convert to fraction form
   21,978.39/32,969.10 = 8,830.77/x
3. Step 3: Cross multiply
   21,978.39x = 32,969.10 × 8,830.77
4. Step 4: Simplify right side
   21,978.39x = 291,142,609.30
5. Step 5: Solve for x
   x = 291,142,609.30/21,978.39
6. Step 6: Final answer
   x = 13,246.77