Finding the Fourth Proportional to 91,128.80, 136,692.05 and 31,156.67

Step by Step Solution

1. Step 1: Write the proportion equation
   91,128.80 : 136,692.05 = 31,156.67 : x
2. Step 2: Convert to fraction form
   91,128.80/136,692.05 = 31,156.67/x
3. Step 3: Cross multiply
   91,128.80x = 136,692.05 × 31,156.67
4. Step 4: Simplify right side
   91,128.80x = 4,258,869,279.42
5. Step 5: Solve for x
   x = 4,258,869,279.42/91,128.80
6. Step 6: Final answer
   x = 46,734.61