Finding the Fourth Proportional to 13,397.86, 18,490.35 and 7,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,397.86 : 18,490.35 = 7,808.50 : x
2. Step 2: Convert to fraction form
   13,397.86/18,490.35 = 7,808.50/x
3. Step 3: Cross multiply
   13,397.86x = 18,490.35 × 7,808.50
4. Step 4: Simplify right side
   13,397.86x = 144,381,897.98
5. Step 5: Solve for x
   x = 144,381,897.98/13,397.86
6. Step 6: Final answer
   x = 10,776.49