Finding the Fourth Proportional to 10,085.10, 15,139.80 and 10,012.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,085.10 : 15,139.80 = 10,012.20 : x
2. Step 2: Convert to fraction form
   10,085.10/15,139.80 = 10,012.20/x
3. Step 3: Cross multiply
   10,085.10x = 15,139.80 × 10,012.20
4. Step 4: Simplify right side
   10,085.10x = 151,582,705.56
5. Step 5: Solve for x
   x = 151,582,705.56/10,085.10
6. Step 6: Final answer
   x = 15,030.36