Finding the Fourth Proportional to 8,402.86, 12,601.29 and 2,779.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,402.86 : 12,601.29 = 2,779.50 : x
2. Step 2: Convert to fraction form
   8,402.86/12,601.29 = 2,779.50/x
3. Step 3: Cross multiply
   8,402.86x = 12,601.29 × 2,779.50
4. Step 4: Simplify right side
   8,402.86x = 35,025,256.72
5. Step 5: Solve for x
   x = 35,025,256.72/8,402.86
6. Step 6: Final answer
   x = 4,168.26