Finding the Fourth Proportional to 78,807, 108,738.78 and 46,978.86

Step by Step Solution

1. Step 1: Write the proportion equation
   78,807 : 108,738.78 = 46,978.86 : x
2. Step 2: Convert to fraction form
   78,807/108,738.78 = 46,978.86/x
3. Step 3: Cross multiply
   78,807x = 108,738.78 × 46,978.86
4. Step 4: Simplify right side
   78,807x = 5,108,423,922.19
5. Step 5: Solve for x
   x = 5,108,423,922.19/78,807
6. Step 6: Final answer
   x = 64,821.96