Finding the Fourth Proportional to 48,321.30, 72,478.69 and 13,258.02

Step by Step Solution

1. Step 1: Write the proportion equation
   48,321.30 : 72,478.69 = 13,258.02 : x
2. Step 2: Convert to fraction form
   48,321.30/72,478.69 = 13,258.02/x
3. Step 3: Cross multiply
   48,321.30x = 72,478.69 × 13,258.02
4. Step 4: Simplify right side
   48,321.30x = 960,923,921.59
5. Step 5: Solve for x
   x = 960,923,921.59/48,321.30
6. Step 6: Final answer
   x = 19,886.14