Finding the Fourth Proportional to 156,788.90, 235,086.15 and 90,196.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,788.90 : 235,086.15 = 90,196.10 : x
2. Step 2: Convert to fraction form
   156,788.90/235,086.15 = 90,196.10/x
3. Step 3: Cross multiply
   156,788.90x = 235,086.15 × 90,196.10
4. Step 4: Simplify right side
   156,788.90x = 21,203,853,894.02
5. Step 5: Solve for x
   x = 21,203,853,894.02/156,788.90
6. Step 6: Final answer
   x = 135,238.23