Finding the Fourth Proportional to 42,876.72, 64,303.20 and 12,884.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,876.72 : 64,303.20 = 12,884.04 : x
2. Step 2: Convert to fraction form
   42,876.72/64,303.20 = 12,884.04/x
3. Step 3: Cross multiply
   42,876.72x = 64,303.20 × 12,884.04
4. Step 4: Simplify right side
   42,876.72x = 828,485,000.93
5. Step 5: Solve for x
   x = 828,485,000.93/42,876.72
6. Step 6: Final answer
   x = 19,322.49