Finding the Fourth Proportional to 12,938.32, 19,406.72 and 3,578.11

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.32 : 19,406.72 = 3,578.11 : x
2. Step 2: Convert to fraction form
   12,938.32/19,406.72 = 3,578.11/x
3. Step 3: Cross multiply
   12,938.32x = 19,406.72 × 3,578.11
4. Step 4: Simplify right side
   12,938.32x = 69,439,378.90
5. Step 5: Solve for x
   x = 69,439,378.90/12,938.32
6. Step 6: Final answer
   x = 5,366.95