Finding the Fourth Proportional to 106,990.47, 147,646.59 and 61,668.09

Step by Step Solution

1. Step 1: Write the proportion equation
   106,990.47 : 147,646.59 = 61,668.09 : x
2. Step 2: Convert to fraction form
   106,990.47/147,646.59 = 61,668.09/x
3. Step 3: Cross multiply
   106,990.47x = 147,646.59 × 61,668.09
4. Step 4: Simplify right side
   106,990.47x = 9,105,083,200.31
5. Step 5: Solve for x
   x = 9,105,083,200.31/106,990.47
6. Step 6: Final answer
   x = 85,101.82