Finding the Fourth Proportional to 156,778.90, 235,071.15 and 90,186.10

Step by Step Solution

1. Step 1: Write the proportion equation
   156,778.90 : 235,071.15 = 90,186.10 : x
2. Step 2: Convert to fraction form
   156,778.90/235,071.15 = 90,186.10/x
3. Step 3: Cross multiply
   156,778.90x = 235,071.15 × 90,186.10
4. Step 4: Simplify right side
   156,778.90x = 21,200,150,241.02
5. Step 5: Solve for x
   x = 21,200,150,241.02/156,778.90
6. Step 6: Final answer
   x = 135,223.24