Finding the Fourth Proportional to 5,422.32, 8,123.72 and 5,130.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,422.32 : 8,123.72 = 5,130.72 : x
2. Step 2: Convert to fraction form
   5,422.32/8,123.72 = 5,130.72/x
3. Step 3: Cross multiply
   5,422.32x = 8,123.72 × 5,130.72
4. Step 4: Simplify right side
   5,422.32x = 41,680,532.68
5. Step 5: Solve for x
   x = 41,680,532.68/5,422.32
6. Step 6: Final answer
   x = 7,686.84