Finding the Fourth Proportional to 78,120.18, 107,816.55 and 47,900.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,120.18 : 107,816.55 = 47,900.16 : x
2. Step 2: Convert to fraction form
   78,120.18/107,816.55 = 47,900.16/x
3. Step 3: Cross multiply
   78,120.18x = 107,816.55 × 47,900.16
4. Step 4: Simplify right side
   78,120.18x = 5,164,429,995.65
5. Step 5: Solve for x
   x = 5,164,429,995.65/78,120.18
6. Step 6: Final answer
   x = 66,108.78