Finding the Fourth Proportional to 312,978.23, 469,493.61 and 99,776.43

Step by Step Solution

1. Step 1: Write the proportion equation
   312,978.23 : 469,493.61 = 99,776.43 : x
2. Step 2: Convert to fraction form
   312,978.23/469,493.61 = 99,776.43/x
3. Step 3: Cross multiply
   312,978.23x = 469,493.61 × 99,776.43
4. Step 4: Simplify right side
   312,978.23x = 46,844,395,814.73
5. Step 5: Solve for x
   x = 46,844,395,814.73/312,978.23
6. Step 6: Final answer
   x = 149,673.02