Finding the Fourth Proportional to 105,438.22, 145,564.90 and 69,731.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,438.22 : 145,564.90 = 69,731.80 : x
2. Step 2: Convert to fraction form
   105,438.22/145,564.90 = 69,731.80/x
3. Step 3: Cross multiply
   105,438.22x = 145,564.90 × 69,731.80
4. Step 4: Simplify right side
   105,438.22x = 10,150,502,493.82
5. Step 5: Solve for x
   x = 10,150,502,493.82/105,438.22
6. Step 6: Final answer
   x = 96,269.67