Finding the Fourth Proportional to 249,617.30, 374,427.55 and 99,870.10

Step by Step Solution

1. Step 1: Write the proportion equation
   249,617.30 : 374,427.55 = 99,870.10 : x
2. Step 2: Convert to fraction form
   249,617.30/374,427.55 = 99,870.10/x
3. Step 3: Cross multiply
   249,617.30x = 374,427.55 × 99,870.10
4. Step 4: Simplify right side
   249,617.30x = 37,394,116,861.26
5. Step 5: Solve for x
   x = 37,394,116,861.26/249,617.30
6. Step 6: Final answer
   x = 149,805.79