Finding the Fourth Proportional to 52,215.04, 78,322.20 and 12,772.72

Step by Step Solution

1. Step 1: Write the proportion equation
   52,215.04 : 78,322.20 = 12,772.72 : x
2. Step 2: Convert to fraction form
   52,215.04/78,322.20 = 12,772.72/x
3. Step 3: Cross multiply
   52,215.04x = 78,322.20 × 12,772.72
4. Step 4: Simplify right side
   52,215.04x = 1,000,387,530.38
5. Step 5: Solve for x
   x = 1,000,387,530.38/52,215.04
6. Step 6: Final answer
   x = 19,158.99