Finding the Fourth Proportional to 105,240.53, 145,273.50 and 64,970.57

Step by Step Solution

1. Step 1: Write the proportion equation
   105,240.53 : 145,273.50 = 64,970.57 : x
2. Step 2: Convert to fraction form
   105,240.53/145,273.50 = 64,970.57/x
3. Step 3: Cross multiply
   105,240.53x = 145,273.50 × 64,970.57
4. Step 4: Simplify right side
   105,240.53x = 9,438,501,374.53
5. Step 5: Solve for x
   x = 9,438,501,374.53/105,240.53
6. Step 6: Final answer
   x = 89,685.05