Finding the Fourth Proportional to 11,300.70, 16,903.05 and 10,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,300.70 : 16,903.05 = 10,139.10 : x
2. Step 2: Convert to fraction form
   11,300.70/16,903.05 = 10,139.10/x
3. Step 3: Cross multiply
   11,300.70x = 16,903.05 × 10,139.10
4. Step 4: Simplify right side
   11,300.70x = 171,381,714.26
5. Step 5: Solve for x
   x = 171,381,714.26/11,300.70
6. Step 6: Final answer
   x = 15,165.58