Finding the Fourth Proportional to 692,918.79, 1,039,380.59 and 213,143.34

Step by Step Solution

1. Step 1: Write the proportion equation
   692,918.79 : 1,039,380.59 = 213,143.34 : x
2. Step 2: Convert to fraction form
   692,918.79/1,039,380.59 = 213,143.34/x
3. Step 3: Cross multiply
   692,918.79x = 1,039,380.59 × 213,143.34
4. Step 4: Simplify right side
   692,918.79x = 221,537,051,016.63
5. Step 5: Solve for x
   x = 221,537,051,016.63/692,918.79
6. Step 6: Final answer
   x = 319,715.75