Finding the Fourth Proportional to 78,585.57, 108,450.18 and 42,777.99

Step by Step Solution

1. Step 1: Write the proportion equation
   78,585.57 : 108,450.18 = 42,777.99 : x
2. Step 2: Convert to fraction form
   78,585.57/108,450.18 = 42,777.99/x
3. Step 3: Cross multiply
   78,585.57x = 108,450.18 × 42,777.99
4. Step 4: Simplify right side
   78,585.57x = 4,639,280,715.54
5. Step 5: Solve for x
   x = 4,639,280,715.54/78,585.57
6. Step 6: Final answer
   x = 59,034.77