Finding the Fourth Proportional to 31,191.42, 46,704.90 and 18,681.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,191.42 : 46,704.90 = 18,681.78 : x
2. Step 2: Convert to fraction form
   31,191.42/46,704.90 = 18,681.78/x
3. Step 3: Cross multiply
   31,191.42x = 46,704.90 × 18,681.78
4. Step 4: Simplify right side
   31,191.42x = 872,530,666.72
5. Step 5: Solve for x
   x = 872,530,666.72/31,191.42
6. Step 6: Final answer
   x = 27,973.42