Finding the Fourth Proportional to 56,164.35, 84,197.27 and 21,128.61

Step by Step Solution

1. Step 1: Write the proportion equation
   56,164.35 : 84,197.27 = 21,128.61 : x
2. Step 2: Convert to fraction form
   56,164.35/84,197.27 = 21,128.61/x
3. Step 3: Cross multiply
   56,164.35x = 84,197.27 × 21,128.61
4. Step 4: Simplify right side
   56,164.35x = 1,778,971,333.72
5. Step 5: Solve for x
   x = 1,778,971,333.72/56,164.35
6. Step 6: Final answer
   x = 31,674.39