Finding the Fourth Proportional to 10,090.78, 15,126.42 and 5,162.74

Step by Step Solution

1. Step 1: Write the proportion equation
   10,090.78 : 15,126.42 = 5,162.74 : x
2. Step 2: Convert to fraction form
   10,090.78/15,126.42 = 5,162.74/x
3. Step 3: Cross multiply
   10,090.78x = 15,126.42 × 5,162.74
4. Step 4: Simplify right side
   10,090.78x = 78,093,773.59
5. Step 5: Solve for x
   x = 78,093,773.59/10,090.78
6. Step 6: Final answer
   x = 7,739.12