Finding the Fourth Proportional to 103,426.30, 155,175.90 and 99,781.30

Step by Step Solution

1. Step 1: Write the proportion equation
   103,426.30 : 155,175.90 = 99,781.30 : x
2. Step 2: Convert to fraction form
   103,426.30/155,175.90 = 99,781.30/x
3. Step 3: Cross multiply
   103,426.30x = 155,175.90 × 99,781.30
4. Step 4: Simplify right side
   103,426.30x = 15,483,653,030.67
5. Step 5: Solve for x
   x = 15,483,653,030.67/103,426.30
6. Step 6: Final answer
   x = 149,707.12