Finding the Fourth Proportional to 212,538.61, 318,607.57 and 105,821.83

Step by Step Solution

1. Step 1: Write the proportion equation
   212,538.61 : 318,607.57 = 105,821.83 : x
2. Step 2: Convert to fraction form
   212,538.61/318,607.57 = 105,821.83/x
3. Step 3: Cross multiply
   212,538.61x = 318,607.57 × 105,821.83
4. Step 4: Simplify right side
   212,538.61x = 33,715,636,109.25
5. Step 5: Solve for x
   x = 33,715,636,109.25/212,538.61
6. Step 6: Final answer
   x = 158,632.99