Finding the Fourth Proportional to 72,886.91, 109,330.38 and 56,271.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,886.91 : 109,330.38 = 56,271.20 : x
2. Step 2: Convert to fraction form
   72,886.91/109,330.38 = 56,271.20/x
3. Step 3: Cross multiply
   72,886.91x = 109,330.38 × 56,271.20
4. Step 4: Simplify right side
   72,886.91x = 6,152,151,132.40
5. Step 5: Solve for x
   x = 6,152,151,132.40/72,886.91
6. Step 6: Final answer
   x = 84,406.81