Finding the Fourth Proportional to 1,091,238.72, 1,505,985.15 and 661,536.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091,238.72 : 1,505,985.15 = 661,536.96 : x
2. Step 2: Convert to fraction form
   1,091,238.72/1,505,985.15 = 661,536.96/x
3. Step 3: Cross multiply
   1,091,238.72x = 1,505,985.15 × 661,536.96
4. Step 4: Simplify right side
   1,091,238.72x = 996,264,837,936.14
5. Step 5: Solve for x
   x = 996,264,837,936.14/1,091,238.72
6. Step 6: Final answer
   x = 912,966.91