Finding the Fourth Proportional to 10,083.30, 15,128.03 and 5,156.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,083.30 : 15,128.03 = 5,156.40 : x
2. Step 2: Convert to fraction form
   10,083.30/15,128.03 = 5,156.40/x
3. Step 3: Cross multiply
   10,083.30x = 15,128.03 × 5,156.40
4. Step 4: Simplify right side
   10,083.30x = 78,006,173.89
5. Step 5: Solve for x
   x = 78,006,173.89/10,083.30
6. Step 6: Final answer
   x = 7,736.18