Finding the Fourth Proportional to 105,081.40, 157,362.90 and 69,830.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,081.40 : 157,362.90 = 69,830.20 : x
2. Step 2: Convert to fraction form
   105,081.40/157,362.90 = 69,830.20/x
3. Step 3: Cross multiply
   105,081.40x = 157,362.90 × 69,830.20
4. Step 4: Simplify right side
   105,081.40x = 10,988,682,779.58
5. Step 5: Solve for x
   x = 10,988,682,779.58/105,081.40
6. Step 6: Final answer
   x = 104,573.05