Finding the Fourth Proportional to 156,808.90, 235,116.15 and 90,216.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,808.90 : 235,116.15 = 90,216.10 : x
2. Step 2: Convert to fraction form
   156,808.90/235,116.15 = 90,216.10/x
3. Step 3: Cross multiply
   156,808.90x = 235,116.15 × 90,216.10
4. Step 4: Simplify right side
   156,808.90x = 21,211,262,100.02
5. Step 5: Solve for x
   x = 21,211,262,100.02/156,808.90
6. Step 6: Final answer
   x = 135,268.23