Finding the Fourth Proportional to 139,870.32, 209,656.08 and 55,513.68

Step by Step Solution

1. Step 1: Write the proportion equation
   139,870.32 : 209,656.08 = 55,513.68 : x
2. Step 2: Convert to fraction form
   139,870.32/209,656.08 = 55,513.68/x
3. Step 3: Cross multiply
   139,870.32x = 209,656.08 × 55,513.68
4. Step 4: Simplify right side
   139,870.32x = 11,638,780,535.17
5. Step 5: Solve for x
   x = 11,638,780,535.17/139,870.32
6. Step 6: Final answer
   x = 83,211.22