Finding the Fourth Proportional to 257,017.52, 385,636.55 and 99,356.69

Step by Step Solution

1. Step 1: Write the proportion equation
   257,017.52 : 385,636.55 = 99,356.69 : x
2. Step 2: Convert to fraction form
   257,017.52/385,636.55 = 99,356.69/x
3. Step 3: Cross multiply
   257,017.52x = 385,636.55 × 99,356.69
4. Step 4: Simplify right side
   257,017.52x = 38,315,571,618.33
5. Step 5: Solve for x
   x = 38,315,571,618.33/257,017.52
6. Step 6: Final answer
   x = 149,077.66