Finding the Fourth Proportional to 21,055.85, 31,574.53 and 7,899.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,055.85 : 31,574.53 = 7,899.00 : x
2. Step 2: Convert to fraction form
   21,055.85/31,574.53 = 7,899.00/x
3. Step 3: Cross multiply
   21,055.85x = 31,574.53 × 7,899.00
4. Step 4: Simplify right side
   21,055.85x = 249,407,054.60
5. Step 5: Solve for x
   x = 249,407,054.60/21,055.85
6. Step 6: Final answer
   x = 11,845.02