Finding the Fourth Proportional to 9,978.18, 13,774.42 and 7,108.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.18 : 13,774.42 = 7,108.76 : x
2. Step 2: Convert to fraction form
   9,978.18/13,774.42 = 7,108.76/x
3. Step 3: Cross multiply
   9,978.18x = 13,774.42 × 7,108.76
4. Step 4: Simplify right side
   9,978.18x = 97,919,045.92
5. Step 5: Solve for x
   x = 97,919,045.92/9,978.18
6. Step 6: Final answer
   x = 9,813.32