Finding the Fourth Proportional to 199,904.83, 299,672.72 and 99,978.07

Step by Step Solution

1. Step 1: Write the proportion equation
   199,904.83 : 299,672.72 = 99,978.07 : x
2. Step 2: Convert to fraction form
   199,904.83/299,672.72 = 99,978.07/x
3. Step 3: Cross multiply
   199,904.83x = 299,672.72 × 99,978.07
4. Step 4: Simplify right side
   199,904.83x = 29,960,699,303.10
5. Step 5: Solve for x
   x = 29,960,699,303.10/199,904.83
6. Step 6: Final answer
   x = 149,874.81