Finding the Fourth Proportional to 91,017.56, 136,346.12 and 42,920.32

Step by Step Solution

1. Step 1: Write the proportion equation
   91,017.56 : 136,346.12 = 42,920.32 : x
2. Step 2: Convert to fraction form
   91,017.56/136,346.12 = 42,920.32/x
3. Step 3: Cross multiply
   91,017.56x = 136,346.12 × 42,920.32
4. Step 4: Simplify right side
   91,017.56x = 5,852,018,419.43
5. Step 5: Solve for x
   x = 5,852,018,419.43/91,017.56
6. Step 6: Final answer
   x = 64,295.49