Finding the Fourth Proportional to 31,123, 42,934.93 and 21,054.97

Step by Step Solution

1. Step 1: Write the proportion equation
   31,123 : 42,934.93 = 21,054.97 : x
2. Step 2: Convert to fraction form
   31,123/42,934.93 = 21,054.97/x
3. Step 3: Cross multiply
   31,123x = 42,934.93 × 21,054.97
4. Step 4: Simplify right side
   31,123x = 903,993,663.10
5. Step 5: Solve for x
   x = 903,993,663.10/31,123
6. Step 6: Final answer
   x = 29,045.84