Finding the Fourth Proportional to 111,314.99, 166,695.51 and 77,878.51

Step by Step Solution

1. Step 1: Write the proportion equation
   111,314.99 : 166,695.51 = 77,878.51 : x
2. Step 2: Convert to fraction form
   111,314.99/166,695.51 = 77,878.51/x
3. Step 3: Cross multiply
   111,314.99x = 166,695.51 × 77,878.51
4. Step 4: Simplify right side
   111,314.99x = 12,981,997,942.49
5. Step 5: Solve for x
   x = 12,981,997,942.49/111,314.99
6. Step 6: Final answer
   x = 116,623.99