Finding the Fourth Proportional to 9,898.59, 14,839.69 and 5,215.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,898.59 : 14,839.69 = 5,215.98 : x
2. Step 2: Convert to fraction form
   9,898.59/14,839.69 = 5,215.98/x
3. Step 3: Cross multiply
   9,898.59x = 14,839.69 × 5,215.98
4. Step 4: Simplify right side
   9,898.59x = 77,403,526.25
5. Step 5: Solve for x
   x = 77,403,526.25/9,898.59
6. Step 6: Final answer
   x = 7,819.65