Finding the Fourth Proportional to 105,106.41, 145,045.49 and 64,256.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,106.41 : 145,045.49 = 64,256.90 : x
2. Step 2: Convert to fraction form
   105,106.41/145,045.49 = 64,256.90/x
3. Step 3: Cross multiply
   105,106.41x = 145,045.49 × 64,256.90
4. Step 4: Simplify right side
   105,106.41x = 9,320,172,499.87
5. Step 5: Solve for x
   x = 9,320,172,499.87/105,106.41
6. Step 6: Final answer
   x = 88,673.68