Finding the Fourth Proportional to 31,140.42, 42,979.62 and 19,504.01

Step by Step Solution

1. Step 1: Write the proportion equation
   31,140.42 : 42,979.62 = 19,504.01 : x
2. Step 2: Convert to fraction form
   31,140.42/42,979.62 = 19,504.01/x
3. Step 3: Cross multiply
   31,140.42x = 42,979.62 × 19,504.01
4. Step 4: Simplify right side
   31,140.42x = 838,274,938.28
5. Step 5: Solve for x
   x = 838,274,938.28/31,140.42
6. Step 6: Final answer
   x = 26,919.19