Finding the Fourth Proportional to 105,693.57, 145,839.35 and 69,870.51

Step by Step Solution

1. Step 1: Write the proportion equation
   105,693.57 : 145,839.35 = 69,870.51 : x
2. Step 2: Convert to fraction form
   105,693.57/145,839.35 = 69,870.51/x
3. Step 3: Cross multiply
   105,693.57x = 145,839.35 × 69,870.51
4. Step 4: Simplify right side
   105,693.57x = 10,189,869,937.24
5. Step 5: Solve for x
   x = 10,189,869,937.24/105,693.57
6. Step 6: Final answer
   x = 96,409.55