Finding the Fourth Proportional to 309,498.78, 464,259.17 and 99,109.38

Step by Step Solution

1. Step 1: Write the proportion equation
   309,498.78 : 464,259.17 = 99,109.38 : x
2. Step 2: Convert to fraction form
   309,498.78/464,259.17 = 99,109.38/x
3. Step 3: Cross multiply
   309,498.78x = 464,259.17 × 99,109.38
4. Step 4: Simplify right side
   309,498.78x = 46,012,438,498.01
5. Step 5: Solve for x
   x = 46,012,438,498.01/309,498.78
6. Step 6: Final answer
   x = 148,667.59