Finding the Fourth Proportional to 105,123.59, 145,102.74 and 64,849.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105,123.59 : 145,102.74 = 64,849.91 : x
2. Step 2: Convert to fraction form
   105,123.59/145,102.74 = 64,849.91/x
3. Step 3: Cross multiply
   105,123.59x = 145,102.74 × 64,849.91
4. Step 4: Simplify right side
   105,123.59x = 9,409,899,305.50
5. Step 5: Solve for x
   x = 9,409,899,305.50/105,123.59
6. Step 6: Final answer
   x = 89,512.73