Finding the Fourth Proportional to 13,697.84, 20,499.24 and 8,430.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,697.84 : 20,499.24 = 8,430.50 : x
2. Step 2: Convert to fraction form
   13,697.84/20,499.24 = 8,430.50/x
3. Step 3: Cross multiply
   13,697.84x = 20,499.24 × 8,430.50
4. Step 4: Simplify right side
   13,697.84x = 172,818,842.82
5. Step 5: Solve for x
   x = 172,818,842.82/13,697.84
6. Step 6: Final answer
   x = 12,616.50