Finding the Fourth Proportional to 1,139,487.52, 1,572,428.82 and 623,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,487.52 : 1,572,428.82 = 623,138.72 : x
2. Step 2: Convert to fraction form
   1,139,487.52/1,572,428.82 = 623,138.72/x
3. Step 3: Cross multiply
   1,139,487.52x = 1,572,428.82 × 623,138.72
4. Step 4: Simplify right side
   1,139,487.52x = 979,841,282,185.91
5. Step 5: Solve for x
   x = 979,841,282,185.91/1,139,487.52
6. Step 6: Final answer
   x = 859,896.46