Finding the Fourth Proportional to 98,693.34, 136,150.65 and 64,692.78

Step by Step Solution

1. Step 1: Write the proportion equation
   98,693.34 : 136,150.65 = 64,692.78 : x
2. Step 2: Convert to fraction form
   98,693.34/136,150.65 = 64,692.78/x
3. Step 3: Cross multiply
   98,693.34x = 136,150.65 × 64,692.78
4. Step 4: Simplify right side
   98,693.34x = 8,807,964,047.31
5. Step 5: Solve for x
   x = 8,807,964,047.31/98,693.34
6. Step 6: Final answer
   x = 89,245.78