Finding the Fourth Proportional to 56,499.48, 84,716.42 and 21,420

Step by Step Solution

1. Step 1: Write the proportion equation
   56,499.48 : 84,716.42 = 21,420 : x
2. Step 2: Convert to fraction form
   56,499.48/84,716.42 = 21,420/x
3. Step 3: Cross multiply
   56,499.48x = 84,716.42 × 21,420
4. Step 4: Simplify right side
   56,499.48x = 1,814,625,609.30
5. Step 5: Solve for x
   x = 1,814,625,609.30/56,499.48
6. Step 6: Final answer
   x = 32,117.56