Finding the Fourth Proportional to 31,061.99, 42,859.85 and 18,319.19

Step by Step Solution

1. Step 1: Write the proportion equation
   31,061.99 : 42,859.85 = 18,319.19 : x
2. Step 2: Convert to fraction form
   31,061.99/42,859.85 = 18,319.19/x
3. Step 3: Cross multiply
   31,061.99x = 42,859.85 × 18,319.19
4. Step 4: Simplify right side
   31,061.99x = 785,157,429.63
5. Step 5: Solve for x
   x = 785,157,429.63/31,061.99
6. Step 6: Final answer
   x = 25,277.12