Finding the Fourth Proportional to 21,018.93, 31,528.34 and 6,980.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.93 : 31,528.34 = 6,980.01 : x
2. Step 2: Convert to fraction form
   21,018.93/31,528.34 = 6,980.01/x
3. Step 3: Cross multiply
   21,018.93x = 31,528.34 × 6,980.01
4. Step 4: Simplify right side
   21,018.93x = 220,068,001.53
5. Step 5: Solve for x
   x = 220,068,001.53/21,018.93
6. Step 6: Final answer
   x = 10,469.99