Finding the Fourth Proportional to 261,870.42, 392,977.83 and 143,624.76

Step by Step Solution

1. Step 1: Write the proportion equation
   261,870.42 : 392,977.83 = 143,624.76 : x
2. Step 2: Convert to fraction form
   261,870.42/392,977.83 = 143,624.76/x
3. Step 3: Cross multiply
   261,870.42x = 392,977.83 × 143,624.76
4. Step 4: Simplify right side
   261,870.42x = 56,441,346,519.07
5. Step 5: Solve for x
   x = 56,441,346,519.07/261,870.42
6. Step 6: Final answer
   x = 215,531.58