Finding the Fourth Proportional to 43,312.16, 64,976.34 and 13,722.05

Step by Step Solution

1. Step 1: Write the proportion equation
   43,312.16 : 64,976.34 = 13,722.05 : x
2. Step 2: Convert to fraction form
   43,312.16/64,976.34 = 13,722.05/x
3. Step 3: Cross multiply
   43,312.16x = 64,976.34 × 13,722.05
4. Step 4: Simplify right side
   43,312.16x = 891,608,586.30
5. Step 5: Solve for x
   x = 891,608,586.30/43,312.16
6. Step 6: Final answer
   x = 20,585.64