Finding the Fourth Proportional to 10,978.08, 15,145.92 and 7,620

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.08 : 15,145.92 = 7,620 : x
2. Step 2: Convert to fraction form
   10,978.08/15,145.92 = 7,620/x
3. Step 3: Cross multiply
   10,978.08x = 15,145.92 × 7,620
4. Step 4: Simplify right side
   10,978.08x = 115,411,910.40
5. Step 5: Solve for x
   x = 115,411,910.40/10,978.08
6. Step 6: Final answer
   x = 10,512.94