Finding the Fourth Proportional to 103,638.50, 143,026.38 and 61,196.12

Step by Step Solution

1. Step 1: Write the proportion equation
   103,638.50 : 143,026.38 = 61,196.12 : x
2. Step 2: Convert to fraction form
   103,638.50/143,026.38 = 61,196.12/x
3. Step 3: Cross multiply
   103,638.50x = 143,026.38 × 61,196.12
4. Step 4: Simplify right side
   103,638.50x = 8,752,659,513.65
5. Step 5: Solve for x
   x = 8,752,659,513.65/103,638.50
6. Step 6: Final answer
   x = 84,453.75