Finding the Fourth Proportional to 105,089.34, 145,019.40 and 57,341.70

Step by Step Solution

1. Step 1: Write the proportion equation
   105,089.34 : 145,019.40 = 57,341.70 : x
2. Step 2: Convert to fraction form
   105,089.34/145,019.40 = 57,341.70/x
3. Step 3: Cross multiply
   105,089.34x = 145,019.40 × 57,341.70
4. Step 4: Simplify right side
   105,089.34x = 8,315,658,928.98
5. Step 5: Solve for x
   x = 8,315,658,928.98/105,089.34
6. Step 6: Final answer
   x = 79,129.42