Finding the Fourth Proportional to 13,298.31, 19,950.91 and 4,978.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,298.31 : 19,950.91 = 4,978.98 : x
2. Step 2: Convert to fraction form
   13,298.31/19,950.91 = 4,978.98/x
3. Step 3: Cross multiply
   13,298.31x = 19,950.91 × 4,978.98
4. Step 4: Simplify right side
   13,298.31x = 99,335,169.42
5. Step 5: Solve for x
   x = 99,335,169.42/13,298.31
6. Step 6: Final answer
   x = 7,469.76