Finding the Fourth Proportional to 28,191.52, 42,303.48 and 12,607.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,191.52 : 42,303.48 = 12,607.12 : x
2. Step 2: Convert to fraction form
   28,191.52/42,303.48 = 12,607.12/x
3. Step 3: Cross multiply
   28,191.52x = 42,303.48 × 12,607.12
4. Step 4: Simplify right side
   28,191.52x = 533,325,048.78
5. Step 5: Solve for x
   x = 533,325,048.78/28,191.52
6. Step 6: Final answer
   x = 18,917.92