Finding the Fourth Proportional to 10,139.74, 15,212.86 and 4,875.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.74 : 15,212.86 = 4,875.12 : x
2. Step 2: Convert to fraction form
   10,139.74/15,212.86 = 4,875.12/x
3. Step 3: Cross multiply
   10,139.74x = 15,212.86 × 4,875.12
4. Step 4: Simplify right side
   10,139.74x = 74,164,505.86
5. Step 5: Solve for x
   x = 74,164,505.86/10,139.74
6. Step 6: Final answer
   x = 7,314.24