Finding the Fourth Proportional to 28,449.16, 42,695.52 and 12,877.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,449.16 : 42,695.52 = 12,877.72 : x
2. Step 2: Convert to fraction form
   28,449.16/42,695.52 = 12,877.72/x
3. Step 3: Cross multiply
   28,449.16x = 42,695.52 × 12,877.72
4. Step 4: Simplify right side
   28,449.16x = 549,820,951.81
5. Step 5: Solve for x
   x = 549,820,951.81/28,449.16
6. Step 6: Final answer
   x = 19,326.44