Finding the Fourth Proportional to 10,128.95, 13,978.55 and 5,652.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.95 : 13,978.55 = 5,652.89 : x
2. Step 2: Convert to fraction form
   10,128.95/13,978.55 = 5,652.89/x
3. Step 3: Cross multiply
   10,128.95x = 13,978.55 × 5,652.89
4. Step 4: Simplify right side
   10,128.95x = 79,019,177.25
5. Step 5: Solve for x
   x = 79,019,177.25/10,128.95
6. Step 6: Final answer
   x = 7,801.32