Finding the Fourth Proportional to 10,978.52, 15,152.06 and 7,212.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.52 : 15,152.06 = 7,212.59 : x
2. Step 2: Convert to fraction form
   10,978.52/15,152.06 = 7,212.59/x
3. Step 3: Cross multiply
   10,978.52x = 15,152.06 × 7,212.59
4. Step 4: Simplify right side
   10,978.52x = 109,285,484.61
5. Step 5: Solve for x
   x = 109,285,484.61/10,978.52
6. Step 6: Final answer
   x = 9,954.49