Finding the Fourth Proportional to 91,100.21, 136,521.86 and 43,017.51

Step by Step Solution

1. Step 1: Write the proportion equation
   91,100.21 : 136,521.86 = 43,017.51 : x
2. Step 2: Convert to fraction form
   91,100.21/136,521.86 = 43,017.51/x
3. Step 3: Cross multiply
   91,100.21x = 136,521.86 × 43,017.51
4. Step 4: Simplify right side
   91,100.21x = 5,872,831,016.61
5. Step 5: Solve for x
   x = 5,872,831,016.61/91,100.21
6. Step 6: Final answer
   x = 64,465.61