Finding the Fourth Proportional to 93,019.29, 139,525.80 and 40,428.78

Step by Step Solution

1. Step 1: Write the proportion equation
   93,019.29 : 139,525.80 = 40,428.78 : x
2. Step 2: Convert to fraction form
   93,019.29/139,525.80 = 40,428.78/x
3. Step 3: Cross multiply
   93,019.29x = 139,525.80 × 40,428.78
4. Step 4: Simplify right side
   93,019.29x = 5,640,857,872.52
5. Step 5: Solve for x
   x = 5,640,857,872.52/93,019.29
6. Step 6: Final answer
   x = 60,641.81