Finding the Fourth Proportional to 139,869.82, 209,655.33 and 55,513.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,869.82 : 209,655.33 = 55,513.18 : x
2. Step 2: Convert to fraction form
   139,869.82/209,655.33 = 55,513.18/x
3. Step 3: Cross multiply
   139,869.82x = 209,655.33 × 55,513.18
4. Step 4: Simplify right side
   139,869.82x = 11,638,634,072.25
5. Step 5: Solve for x
   x = 11,638,634,072.25/139,869.82
6. Step 6: Final answer
   x = 83,210.47