Finding the Fourth Proportional to 38,898.32, 58,359.72 and 13,921.34

Step by Step Solution

1. Step 1: Write the proportion equation
   38,898.32 : 58,359.72 = 13,921.34 : x
2. Step 2: Convert to fraction form
   38,898.32/58,359.72 = 13,921.34/x
3. Step 3: Cross multiply
   38,898.32x = 58,359.72 × 13,921.34
4. Step 4: Simplify right side
   38,898.32x = 812,445,504.42
5. Step 5: Solve for x
   x = 812,445,504.42/38,898.32
6. Step 6: Final answer
   x = 20,886.39