Finding the Fourth Proportional to 14,128.31, 19,497.98 and 7,840.69

Step by Step Solution

1. Step 1: Write the proportion equation
   14,128.31 : 19,497.98 = 7,840.69 : x
2. Step 2: Convert to fraction form
   14,128.31/19,497.98 = 7,840.69/x
3. Step 3: Cross multiply
   14,128.31x = 19,497.98 × 7,840.69
4. Step 4: Simplify right side
   14,128.31x = 152,877,587.66
5. Step 5: Solve for x
   x = 152,877,587.66/14,128.31
6. Step 6: Final answer
   x = 10,820.65