Finding the Fourth Proportional to 10,070.74, 15,111.24 and 7,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,070.74 : 15,111.24 = 7,128.10 : x
2. Step 2: Convert to fraction form
   10,070.74/15,111.24 = 7,128.10/x
3. Step 3: Cross multiply
   10,070.74x = 15,111.24 × 7,128.10
4. Step 4: Simplify right side
   10,070.74x = 107,714,429.84
5. Step 5: Solve for x
   x = 107,714,429.84/10,070.74
6. Step 6: Final answer
   x = 10,695.78