Finding the Third Proportional to 387,189.56 and 830,428.31

Step by Step Solution

1. Step 1: Write the proportion equation
   387,189.56 : 830,428.31 = 830,428.31 : x
2. Step 2: Convert to fraction form
   387,189.56/830,428.31 = 830,428.31/x
3. Step 3: Cross multiply
   387,189.56x = 830,428.31 × 830,428.31
4. Step 4: Simplify right side
   387,189.56x = 689,611,182,201.60
5. Step 5: Solve for x
   x = 689,611,182,201.60/387,189.56
6. Step 6: Final answer
   x = 1,781,068.63