Finding the Fourth Proportional to 31,145.99, 42,962.90 and 19,200.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.99 : 42,962.90 = 19,200.42 : x
2. Step 2: Convert to fraction form
   31,145.99/42,962.90 = 19,200.42/x
3. Step 3: Cross multiply
   31,145.99x = 42,962.90 × 19,200.42
4. Step 4: Simplify right side
   31,145.99x = 824,905,628.42
5. Step 5: Solve for x
   x = 824,905,628.42/31,145.99
6. Step 6: Final answer
   x = 26,485.14