Finding the Fourth Proportional to 91,018.56, 136,347.62 and 42,921.32

Step by Step Solution

1. Step 1: Write the proportion equation
   91,018.56 : 136,347.62 = 42,921.32 : x
2. Step 2: Convert to fraction form
   91,018.56/136,347.62 = 42,921.32/x
3. Step 3: Cross multiply
   91,018.56x = 136,347.62 × 42,921.32
4. Step 4: Simplify right side
   91,018.56x = 5,852,219,829.26
5. Step 5: Solve for x
   x = 5,852,219,829.26/91,018.56
6. Step 6: Final answer
   x = 64,296.99