Finding the Fourth Proportional to 9,415.78, 14,126.72 and 7,342.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.78 : 14,126.72 = 7,342.91 : x
2. Step 2: Convert to fraction form
   9,415.78/14,126.72 = 7,342.91/x
3. Step 3: Cross multiply
   9,415.78x = 14,126.72 × 7,342.91
4. Step 4: Simplify right side
   9,415.78x = 103,731,222.67
5. Step 5: Solve for x
   x = 103,731,222.67/9,415.78
6. Step 6: Final answer
   x = 11,016.75