Finding the Fourth Proportional to 78,300.16, 108,054.50 and 42,490.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,300.16 : 108,054.50 = 42,490.18 : x
2. Step 2: Convert to fraction form
   78,300.16/108,054.50 = 42,490.18/x
3. Step 3: Cross multiply
   78,300.16x = 108,054.50 × 42,490.18
4. Step 4: Simplify right side
   78,300.16x = 4,591,255,154.81
5. Step 5: Solve for x
   x = 4,591,255,154.81/78,300.16
6. Step 6: Final answer
   x = 58,636.60