Finding the Fourth Proportional to 12,899.86, 19,351.61 and 4,132.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.86 : 19,351.61 = 4,132.72 : x
2. Step 2: Convert to fraction form
   12,899.86/19,351.61 = 4,132.72/x
3. Step 3: Cross multiply
   12,899.86x = 19,351.61 × 4,132.72
4. Step 4: Simplify right side
   12,899.86x = 79,974,804.70
5. Step 5: Solve for x
   x = 79,974,804.70/12,899.86
6. Step 6: Final answer
   x = 6,199.67