Finding the Fourth Proportional to 86,290.92, 129,467.52 and 30,139.32

Step by Step Solution

1. Step 1: Write the proportion equation
   86,290.92 : 129,467.52 = 30,139.32 : x
2. Step 2: Convert to fraction form
   86,290.92/129,467.52 = 30,139.32/x
3. Step 3: Cross multiply
   86,290.92x = 129,467.52 × 30,139.32
4. Step 4: Simplify right side
   86,290.92x = 3,902,063,014.89
5. Step 5: Solve for x
   x = 3,902,063,014.89/86,290.92
6. Step 6: Final answer
   x = 45,219.86