Finding the Fourth Proportional to 307,141.79, 424,071.79 and 215,456.00

Step by Step Solution

1. Step 1: Write the proportion equation
   307,141.79 : 424,071.79 = 215,456.00 : x
2. Step 2: Convert to fraction form
   307,141.79/424,071.79 = 215,456.00/x
3. Step 3: Cross multiply
   307,141.79x = 424,071.79 × 215,456.00
4. Step 4: Simplify right side
   307,141.79x = 91,368,808,927.24
5. Step 5: Solve for x
   x = 91,368,808,927.24/307,141.79
6. Step 6: Final answer
   x = 297,480.88