Finding the Fourth Proportional to 139,488.32, 209,111.52 and 56,328.32

Step by Step Solution

1. Step 1: Write the proportion equation
   139,488.32 : 209,111.52 = 56,328.32 : x
2. Step 2: Convert to fraction form
   139,488.32/209,111.52 = 56,328.32/x
3. Step 3: Cross multiply
   139,488.32x = 209,111.52 × 56,328.32
4. Step 4: Simplify right side
   139,488.32x = 11,778,900,614.25
5. Step 5: Solve for x
   x = 11,778,900,614.25/139,488.32
6. Step 6: Final answer
   x = 84,443.63