Finding the Fourth Proportional to 286,131.75, 429,274.17 and 99,143.25

Step by Step Solution

1. Step 1: Write the proportion equation
   286,131.75 : 429,274.17 = 99,143.25 : x
2. Step 2: Convert to fraction form
   286,131.75/429,274.17 = 99,143.25/x
3. Step 3: Cross multiply
   286,131.75x = 429,274.17 × 99,143.25
4. Step 4: Simplify right side
   286,131.75x = 42,559,636,354.85
5. Step 5: Solve for x
   x = 42,559,636,354.85/286,131.75
6. Step 6: Final answer
   x = 148,741.40