Finding the Fourth Proportional to 211,815, 292,330.62 and 122,391

Step by Step Solution

1. Step 1: Write the proportion equation
   211,815 : 292,330.62 = 122,391 : x
2. Step 2: Convert to fraction form
   211,815/292,330.62 = 122,391/x
3. Step 3: Cross multiply
   211,815x = 292,330.62 × 122,391
4. Step 4: Simplify right side
   211,815x = 35,778,636,912.42
5. Step 5: Solve for x
   x = 35,778,636,912.42/211,815
6. Step 6: Final answer
   x = 168,914.56