Finding the Fourth Proportional to 101,691, 140,158.31 and 67,638.60

Step by Step Solution

1. Step 1: Write the proportion equation
   101,691 : 140,158.31 = 67,638.60 : x
2. Step 2: Convert to fraction form
   101,691/140,158.31 = 67,638.60/x
3. Step 3: Cross multiply
   101,691x = 140,158.31 × 67,638.60
4. Step 4: Simplify right side
   101,691x = 9,480,111,866.77
5. Step 5: Solve for x
   x = 9,480,111,866.77/101,691
6. Step 6: Final answer
   x = 93,224.69