Finding the Fourth Proportional to 56,188.39, 84,294.89 and 21,128.04

Step by Step Solution

1. Step 1: Write the proportion equation
   56,188.39 : 84,294.89 = 21,128.04 : x
2. Step 2: Convert to fraction form
   56,188.39/84,294.89 = 21,128.04/x
3. Step 3: Cross multiply
   56,188.39x = 84,294.89 × 21,128.04
4. Step 4: Simplify right side
   56,188.39x = 1,780,985,860.54
5. Step 5: Solve for x
   x = 1,780,985,860.54/56,188.39
6. Step 6: Final answer
   x = 31,696.69