Finding the Fourth Proportional to 10,128.27, 13,977.01 and 5,590.95

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.27 : 13,977.01 = 5,590.95 : x
2. Step 2: Convert to fraction form
   10,128.27/13,977.01 = 5,590.95/x
3. Step 3: Cross multiply
   10,128.27x = 13,977.01 × 5,590.95
4. Step 4: Simplify right side
   10,128.27x = 78,144,715.14
5. Step 5: Solve for x
   x = 78,144,715.14/10,128.27
6. Step 6: Final answer
   x = 7,715.51