Finding the Third Proportional to 56,421.84 and 87,645.59

Step by Step Solution

1. Step 1: Write the proportion equation
   56,421.84 : 87,645.59 = 87,645.59 : x
2. Step 2: Convert to fraction form
   56,421.84/87,645.59 = 87,645.59/x
3. Step 3: Cross multiply
   56,421.84x = 87,645.59 × 87,645.59
4. Step 4: Simplify right side
   56,421.84x = 7,681,748,734.33
5. Step 5: Solve for x
   x = 7,681,748,734.33/56,421.84
6. Step 6: Final answer
   x = 136,148.49