Finding the Fourth Proportional to 39,362.31, 54,319.71 and 21,458.07

Step by Step Solution

1. Step 1: Write the proportion equation
   39,362.31 : 54,319.71 = 21,458.07 : x
2. Step 2: Convert to fraction form
   39,362.31/54,319.71 = 21,458.07/x
3. Step 3: Cross multiply
   39,362.31x = 54,319.71 × 21,458.07
4. Step 4: Simplify right side
   39,362.31x = 1,165,596,139.56
5. Step 5: Solve for x
   x = 1,165,596,139.56/39,362.31
6. Step 6: Final answer
   x = 29,611.99