Finding the Fourth Proportional to 10,925.16, 15,071.40 and 7,146.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,925.16 : 15,071.40 = 7,146.78 : x
2. Step 2: Convert to fraction form
   10,925.16/15,071.40 = 7,146.78/x
3. Step 3: Cross multiply
   10,925.16x = 15,071.40 × 7,146.78
4. Step 4: Simplify right side
   10,925.16x = 107,711,980.09
5. Step 5: Solve for x
   x = 107,711,980.09/10,925.16
6. Step 6: Final answer
   x = 9,859.08