Finding the Fourth Proportional to 249,613.30, 374,421.55 and 99,866.10

Step by Step Solution

1. Step 1: Write the proportion equation
   249,613.30 : 374,421.55 = 99,866.10 : x
2. Step 2: Convert to fraction form
   249,613.30/374,421.55 = 99,866.10/x
3. Step 3: Cross multiply
   249,613.30x = 374,421.55 × 99,866.10
4. Step 4: Simplify right side
   249,613.30x = 37,392,019,954.46
5. Step 5: Solve for x
   x = 37,392,019,954.46/249,613.30
6. Step 6: Final answer
   x = 149,799.79