Finding the Fourth Proportional to 105,012.86, 144,917.76 and 57,266.55

Step by Step Solution

1. Step 1: Write the proportion equation
   105,012.86 : 144,917.76 = 57,266.55 : x
2. Step 2: Convert to fraction form
   105,012.86/144,917.76 = 57,266.55/x
3. Step 3: Cross multiply
   105,012.86x = 144,917.76 × 57,266.55
4. Step 4: Simplify right side
   105,012.86x = 8,298,939,862.60
5. Step 5: Solve for x
   x = 8,298,939,862.60/105,012.86
6. Step 6: Final answer
   x = 79,027.84