Finding the Third Proportional to 128,276,588.63 and 280,066,327.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,276,588.63 : 280,066,327.50 = 280,066,327.50 : x
2. Step 2: Convert to fraction form
   128,276,588.63/280,066,327.50 = 280,066,327.50/x
3. Step 3: Cross multiply
   128,276,588.63x = 280,066,327.50 × 280,066,327.50
4. Step 4: Simplify right side
   128,276,588.63x = 78,437,147,799,337,264
5. Step 5: Solve for x
   x = 78,437,147,799,337,264/128,276,588.63
6. Step 6: Final answer
   x = 611,468,925.39