Finding the Fourth Proportional to 21,055.35, 31,573.78 and 7,898.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,055.35 : 31,573.78 = 7,898.50 : x
2. Step 2: Convert to fraction form
   21,055.35/31,573.78 = 7,898.50/x
3. Step 3: Cross multiply
   21,055.35x = 31,573.78 × 7,898.50
4. Step 4: Simplify right side
   21,055.35x = 249,385,343.46
5. Step 5: Solve for x
   x = 249,385,343.46/21,055.35
6. Step 6: Final answer
   x = 11,844.27