Finding the Fourth Proportional to 139,367.16, 209,050.72 and 60,479.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,367.16 : 209,050.72 = 60,479.64 : x
2. Step 2: Convert to fraction form
   139,367.16/209,050.72 = 60,479.64/x
3. Step 3: Cross multiply
   139,367.16x = 209,050.72 × 60,479.64
4. Step 4: Simplify right side
   139,367.16x = 12,643,312,287.34
5. Step 5: Solve for x
   x = 12,643,312,287.34/139,367.16
6. Step 6: Final answer
   x = 90,719.45