Finding the Fourth Proportional to 21,779.04, 32,639.76 and 7,914.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,779.04 : 32,639.76 = 7,914.72 : x
2. Step 2: Convert to fraction form
   21,779.04/32,639.76 = 7,914.72/x
3. Step 3: Cross multiply
   21,779.04x = 32,639.76 × 7,914.72
4. Step 4: Simplify right side
   21,779.04x = 258,334,561.27
5. Step 5: Solve for x
   x = 258,334,561.27/21,779.04
6. Step 6: Final answer
   x = 11,861.61