Finding the Fourth Proportional to 154,146, 212,721.48 and 83,490

Step by Step Solution

1. Step 1: Write the proportion equation
   154,146 : 212,721.48 = 83,490 : x
2. Step 2: Convert to fraction form
   154,146/212,721.48 = 83,490/x
3. Step 3: Cross multiply
   154,146x = 212,721.48 × 83,490
4. Step 4: Simplify right side
   154,146x = 17,760,116,365.20
5. Step 5: Solve for x
   x = 17,760,116,365.20/154,146
6. Step 6: Final answer
   x = 115,216.20