Finding the Third Proportional to 438,591 and 911,656.50

Step by Step Solution

1. Step 1: Write the proportion equation
   438,591 : 911,656.50 = 911,656.50 : x
2. Step 2: Convert to fraction form
   438,591/911,656.50 = 911,656.50/x
3. Step 3: Cross multiply
   438,591x = 911,656.50 × 911,656.50
4. Step 4: Simplify right side
   438,591x = 831,117,573,992.25
5. Step 5: Solve for x
   x = 831,117,573,992.25/438,591
6. Step 6: Final answer
   x = 1,894,971.79