Finding the Fourth Proportional to 12,938.64, 19,412.88 and 5,152.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.64 : 19,412.88 = 5,152.92 : x
2. Step 2: Convert to fraction form
   12,938.64/19,412.88 = 5,152.92/x
3. Step 3: Cross multiply
   12,938.64x = 19,412.88 × 5,152.92
4. Step 4: Simplify right side
   12,938.64x = 100,033,017.61
5. Step 5: Solve for x
   x = 100,033,017.61/12,938.64
6. Step 6: Final answer
   x = 7,731.34