Finding the Fourth Proportional to 105,553.81, 145,663 and 57,806.47

Step by Step Solution

1. Step 1: Write the proportion equation
   105,553.81 : 145,663 = 57,806.47 : x
2. Step 2: Convert to fraction form
   105,553.81/145,663 = 57,806.47/x
3. Step 3: Cross multiply
   105,553.81x = 145,663 × 57,806.47
4. Step 4: Simplify right side
   105,553.81x = 8,420,263,839.61
5. Step 5: Solve for x
   x = 8,420,263,839.61/105,553.81
6. Step 6: Final answer
   x = 79,772.24