Finding the Fourth Proportional to 31,157.08, 42,985.02 and 19,985.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,157.08 : 42,985.02 = 19,985.56 : x
2. Step 2: Convert to fraction form
   31,157.08/42,985.02 = 19,985.56/x
3. Step 3: Cross multiply
   31,157.08x = 42,985.02 × 19,985.56
4. Step 4: Simplify right side
   31,157.08x = 859,079,696.31
5. Step 5: Solve for x
   x = 859,079,696.31/31,157.08
6. Step 6: Final answer
   x = 27,572.54