Finding the Fourth Proportional to 21,468.60, 32,196.68 and 7,428.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,468.60 : 32,196.68 = 7,428.06 : x
2. Step 2: Convert to fraction form
   21,468.60/32,196.68 = 7,428.06/x
3. Step 3: Cross multiply
   21,468.60x = 32,196.68 × 7,428.06
4. Step 4: Simplify right side
   21,468.60x = 239,158,870.84
5. Step 5: Solve for x
   x = 239,158,870.84/21,468.60
6. Step 6: Final answer
   x = 11,139.94